Heaneyland!

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Jon points out these two cartoons, which ran within a week of each other:

Cartoon one
Cartoon two

Possible reasons this may have happened:

1) The cartoonist is trying to establish a recurring character, and this is that character's catchphrase.
2) The cartoonist realized the phrasing of the joke in the first cartoon didn't work, and decided to write a version that made more sense (and to do it promptly before he forgot about it).
3) The cartoonist has found a way to make people who don't even read his cartoon blog about it.